According to Huma.com, Sandao Scale is a kind of freshwater fish, mainly distributed in rivers and lakes in China, also known as "Perch", "Grass Carp", "Fat Head Fish" and "Wuchang Fish". It belongs to CYPRINIDAE, with an average body length of about 30 cm, up to 60 cm and a weight of over 1 kg. From this, we know that Sandao scale is a river fish.

Sandao scale is one of the common freshwater fishes in China. Because of its delicious meat and rich nutrition, it is deeply loved by people. In childhood, many people have eaten three scales of stew soup, and its delicious and smooth taste makes people unforgettable. Three scales mainly feed on plankton, benthos and plants. They are carnivorous fish, resistant to pollution and hypoxia, and have strong adaptability. Therefore, they can often be seen in heavily polluted water bodies, and people regard them as "environmental protection fish".